h4,i,span,div,button{margin: 0;padding: 0;}
.detail .header{
    position: absolute;
    top: 0;
    width: 100%;
    height: 0.98rem;
    background-color: black;
}
.back{
    display: block;
    color: #fff;
    border-radius: .08rem;
    box-sizing: border-box;
    font-size: .24rem;
    height: .64rem;
    line-height: .64rem;
    position: absolute;
    top: 50%;
    left:.1rem;
    transform: translateY(-50%);
    box-shadow: 0px -3px 3px 0px #404040;
} 
.back i{
    font-size: .24rem;
    color: #fff;
    transform: rotate(45deg); 
    margin-right: .1rem;
}
.detail .header h4{
    color: #fff;
    font-size: .36rem;
    line-height: .4rem;
    padding: .32rem 0 0;
    text-align: center;
    position: absolute;
    top: 0;
    left: 1.2rem;
    right: 1.2rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap; 
 }
 .main{
     margin-top: .98rem;
 }
.nav{
    width:100%;
    position: fixed;
    left: 0;
    top:1rem;
    padding: .15rem .2rem;
    z-index: 99;
    background: #f2f2f2;
    box-shadow: 0 5px 13px rgba(0,0,0,.12);
    user-select: none;
    font-size: .3rem;
    font-weight: 700;
    box-sizing: border-box;
    display: flex;
    text-align: center;
    border-radius: .03rem;
}
.nav li{
    flex-basis: 25%;
    position: relative;
    color: #606060;
    line-height: .64rem;
    border-left: 1px solid #aeaeae;
    border-top: 1px solid #aeaeae;
    border-bottom: 1px solid #aeaeae;
}
.nav li:first-child,.nav li:last-child{
    border-radius: .03rem 0 0 .03rem;
}
.nav li:last-child{
    border-right: 1px solid #aeaeae;
}
.active{
    background: #bfbfbf;
    background-image: linear-gradient(#aeaeae,#b3b3b3);
    box-shadow: inset 0 1px 3px rgba(0,0,0,.15);
    color: #fff;
}